I put this simple declare and comparison but it doesn't work
DECLARE @StartDate NVARCHAR(15)
SELECT
IV00101.ITMGEDSC,
IV00101.ITEMDESC,
RM00101.CUSTNAME,
RM00101.CPRCSTNM,
IV40600.UserCatLongDescr,
CATS.UserCatLongDescr,
SOP10200.ITEMNMBR,
SOP10200.SOPNUMBE,
SOP10200.QUANTITY,
SOP10200.OXTNDPRC,
SOP10200.SOPTYPE,
SOP10100.DOCDATE,
'Current' as source
FROM ((((PBS.dbo.SOP10200
SOP10200 INNER JOIN PBS.dbo.IV00101 IV00101 ON
SOP10200.ITEMNMBR=IV00101.ITEMNMBR)
INNER JOIN
PBS.dbo.SOP10100 SOP10100 ON
(SOP10200.SOPTYPE=SOP10100.SOPTYPE) AND
(SOP10200.SOPNUMBE=SOP10100.SOPNUMBE))
INNER JOIN
PBS.dbo.IV40600 IV40600 ON
IV00101.ITMGEDSC=IV40600.USCATVAL)
INNER JOIN
PBS.dbo.IV40600 CATS ON
IV00101.USCATVLS_2=CATS.USCATVAL)
INNER JOIN
PBS.dbo.RM00101 RM00101 ON
SOP10100.CUSTNMBR=RM00101.CUSTNMBR
where SOP10100.DOCDATE >= @StartDate